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<div class="document" id="regex-cheat-sheet">
 <div class="body">
<h1 class="title">Regex Cheat Sheet</h1>


<div class="section" id="regex-syntax">
<h1>Regex Syntax</h1>
<table border="1" class="docutils">
<caption>Characters</caption>
<colgroup>
<col width="20%">
<col width="80%">
</colgroup>
<thead valign="bottom">
<tr><th class="head">Character</th>
<th class="head">Matches</th>
</tr>
</thead>
<tbody valign="top">
<tr><td><tt class="docutils literal">a</tt></td>
<td><tt class="docutils literal">a</tt> character</td>
</tr>
<tr><td><tt class="docutils literal">.</tt></td>
<td>Any character (except newline)</td>
</tr>
<tr><td><tt class="docutils literal">\.</tt></td>
<td><tt class="docutils literal">.</tt> character</td>
</tr>
<tr><td><tt class="docutils literal">\\</tt></td>
<td><tt class="docutils literal">\</tt> character</td>
</tr>
<tr><td><tt class="docutils literal">\*</tt></td>
<td><tt class="docutils literal">*</tt> character</td>
</tr>
</tbody>
</table>
<table border="1" class="docutils">
<caption>Character Classes</caption>
<colgroup>
<col width="20%">
<col width="40%">
<col width="40%">
</colgroup>
<thead valign="bottom">
<tr><th class="head">&nbsp;</th>
<th class="head">Matches</th>
<th class="head">Description</th>
</tr>
</thead>
<tbody valign="top">
<tr><td><tt class="docutils literal">[abcd]</tt></td>
<td>Any one of the letters <tt class="docutils literal">a</tt> through <tt class="docutils literal">d</tt></td>
<td>Set of characters</td>
</tr>
<tr><td><tt class="docutils literal">[^abcd]</tt></td>
<td>Any character but <tt class="docutils literal">a</tt>, <tt class="docutils literal">b</tt>, <tt class="docutils literal">c</tt>, or <tt class="docutils literal">d</tt></td>
<td>Complement of a set of characters</td>
</tr>
<tr><td><tt class="docutils literal"><span class="pre">[a-d]</span></tt></td>
<td>Any one of the letters <tt class="docutils literal">a</tt> through <tt class="docutils literal">d</tt></td>
<td>Range of characters</td>
</tr>
<tr><td><tt class="docutils literal"><span class="pre">[a-dz]</span></tt></td>
<td>Any of <tt class="docutils literal">a</tt>, <tt class="docutils literal">b</tt>, <tt class="docutils literal">c</tt>, <tt class="docutils literal">d</tt>, or <tt class="docutils literal">z</tt></td>
<td>Range of characters</td>
</tr>
</tbody>
</table>
<table border="1" class="docutils">
<caption>Special Sequences</caption>
<colgroup>
<col width="30%">
<col width="10%">
<col width="20%">
<col width="40%">
</colgroup>
<thead valign="bottom">
<tr><th class="head stub">Type</th>
<th class="head">Expression</th>
<th class="head">Equivalent To</th>
<th class="head">Description</th>
</tr>
</thead>
<tbody valign="top">
<tr><th class="stub">Word Character</th>
<td><tt class="docutils literal">\w</tt></td>
<td><tt class="docutils literal"><span class="pre">[a-zA-Z0-9_]</span></tt></td>
<td>Alphanumeric or underscore</td>
</tr>
<tr><th class="stub">Non-word Character</th>
<td><tt class="docutils literal">\W</tt></td>
<td><tt class="docutils literal"><span class="pre">[^a-zA-Z0-9_]</span></tt></td>
<td>Anything but a word character</td>
</tr>
<tr><th class="stub">Digit Character</th>
<td><tt class="docutils literal">\d</tt></td>
<td><tt class="docutils literal"><span class="pre">[0-9]</span></tt></td>
<td>Numeric</td>
</tr>
<tr><th class="stub">Non-digit Character</th>
<td><tt class="docutils literal">\D</tt></td>
<td><tt class="docutils literal"><span class="pre">[^0-9]</span></tt></td>
<td>Non-numeric</td>
</tr>
<tr><th class="stub">Whitespace Character</th>
<td><tt class="docutils literal">\s</tt></td>
<td><tt class="docutils literal">[ \t\n\r\f\v]</tt></td>
<td>Whitespace</td>
</tr>
<tr><th class="stub">Non-whitespace Character</th>
<td><tt class="docutils literal">\S</tt></td>
<td><tt class="docutils literal">[^ \t\n\r\f\v]</tt></td>
<td>Anything but a whitespace character</td>
</tr>
</tbody>
</table>
<table border="1" class="docutils">
<caption>Anchors</caption>
<colgroup>
<col width="20%">
<col width="80%">
</colgroup>
<thead valign="bottom">
<tr><th class="head">Anchor</th>
<th class="head">Matches</th>
</tr>
</thead>
<tbody valign="top">
<tr><td><tt class="docutils literal">^</tt></td>
<td>Start of the string</td>
</tr>
<tr><td><tt class="docutils literal">$</tt></td>
<td>End of the string</td>
</tr>
<tr><td><tt class="docutils literal">\b</tt></td>
<td>Boundary between word and non-word characters</td>
</tr>
</tbody>
</table>
<table border="1" class="docutils">
<caption>Groups</caption>
<colgroup>
<col width="60%">
<col width="40%">
</colgroup>
<thead valign="bottom">
<tr><th class="head">Group Type</th>
<th class="head">Expression</th>
</tr>
</thead>
<tbody valign="top">
<tr><td>Capturing</td>
<td><tt class="docutils literal">(</tt> ... <tt class="docutils literal">)</tt></td>
</tr>
<tr><td>Non-capturing</td>
<td><tt class="docutils literal"><span class="pre">(?:</span></tt> ... <tt class="docutils literal">)</tt></td>
</tr>
</tbody>
</table>
<table border="1" class="docutils">
<caption>Quantifiers/Repetition</caption>
<colgroup>
<col width="20%">
<col width="80%">
</colgroup>
<thead valign="bottom">
<tr><th class="head">Quantifier</th>
<th class="head">Modification</th>
</tr>
</thead>
<tbody valign="top">
<tr><td><tt class="docutils literal">{5}</tt></td>
<td>Match expression exactly 5 times</td>
</tr>
<tr><td><tt class="docutils literal">{2,5}</tt></td>
<td>Match expression 2 to 5 times</td>
</tr>
<tr><td><tt class="docutils literal">{2,}</tt></td>
<td>Match expression 2 or more times</td>
</tr>
<tr><td><tt class="docutils literal">{,5}</tt></td>
<td>Match expression 0 to 5 times</td>
</tr>
<tr><td><tt class="docutils literal">*</tt></td>
<td>Match expression 0 or more times</td>
</tr>
<tr><td><tt class="docutils literal">{,}</tt></td>
<td>Match expression 0 or more times</td>
</tr>
<tr><td><tt class="docutils literal">?</tt></td>
<td>Match expression 0 or 1 times</td>
</tr>
<tr><td><tt class="docutils literal">{0,1}</tt></td>
<td>Match expression 0 or 1 times</td>
</tr>
<tr><td><tt class="docutils literal">+</tt></td>
<td>Match expression 1 or more times</td>
</tr>
<tr><td><tt class="docutils literal">{1,}</tt></td>
<td>Match expression 1 or more times</td>
</tr>
</tbody>
</table>
<table border="1" class="docutils">
<caption>Non-greedy quantifiers</caption>
<colgroup>
<col width="20%">
<col width="80%">
</colgroup>
<thead valign="bottom">
<tr><th class="head">Quantifier</th>
<th class="head">Modification</th>
</tr>
</thead>
<tbody valign="top">
<tr><td><tt class="docutils literal">{2,5}?</tt></td>
<td>Match 2 to 5 times (less preferred)</td>
</tr>
<tr><td><tt class="docutils literal"><span class="pre">{2,}?</span></tt></td>
<td>Match 2 or more times (less preferred)</td>
</tr>
<tr><td><tt class="docutils literal">{,5}?</tt></td>
<td>Match 0 to 5 times (less preferred)</td>
</tr>
<tr><td><tt class="docutils literal">*?</tt></td>
<td>Match 0 or more times (less preferred)</td>
</tr>
<tr><td><tt class="docutils literal"><span class="pre">{,}?</span></tt></td>
<td>Match 0 or more times (less preferred)</td>
</tr>
<tr><td><tt class="docutils literal"><span class="pre">??</span></tt></td>
<td>Match 0 or 1 times (less preferred)</td>
</tr>
<tr><td><tt class="docutils literal">{0,1}?</tt></td>
<td>Match 0 or 1 times (less preferred)</td>
</tr>
<tr><td><tt class="docutils literal">+?</tt></td>
<td>Match 1 or more times (less preferred)</td>
</tr>
<tr><td><tt class="docutils literal"><span class="pre">{1,}?</span></tt></td>
<td>Match 1 or more times (less preferred)</td>
</tr>
</tbody>
</table>
<table border="1" class="docutils">
<caption>Alternators</caption>
<colgroup>
<col width="20%">
<col width="80%">
</colgroup>
<thead valign="bottom">
<tr><th class="head">Quantifier</th>
<th class="head">Modification</th>
</tr>
</thead>
<tbody valign="top">
<tr><td><tt class="docutils literal">ABC|DEF</tt></td>
<td>Match string <tt class="docutils literal">ABC</tt> or string <tt class="docutils literal">DEF</tt></td>
</tr>
</tbody>
</table>
<table border="1" class="docutils">
<caption>Lookaround</caption>
<colgroup>
<col width="10%">
<col width="90%">
</colgroup>
<thead valign="bottom">
<tr><th class="head">Quantifier</th>
<th class="head">Modification</th>
</tr>
</thead>
<tbody valign="top">
<tr><td><tt class="docutils literal"><span class="pre">(?=abc)</span></tt></td>
<td>Zero-width match confirming <tt class="docutils literal">abc</tt> will match upcoming chars</td>
</tr>
<tr><td><tt class="docutils literal"><span class="pre">(?!abc)</span></tt></td>
<td>Zero-width match confirming <tt class="docutils literal">abc</tt> will <strong>not</strong> match upcoming chars</td>
</tr>
</tbody>
</table>
</div>
<div class="section" id="python">
<h1>Python</h1>
<table border="1" class="docutils">
<caption>functions</caption>
<colgroup>
<col width="15%">
<col width="55%">
<col width="30%">
</colgroup>
<thead valign="bottom">
<tr><th class="head">Function</th>
<th class="head">Purpose</th>
<th class="head">Usage</th>
</tr>
</thead>
<tbody valign="top">
<tr><td><tt class="docutils literal">re.search</tt></td>
<td>Return a match object if pattern found in string</td>
<td><tt class="docutils literal"><span class="pre">re.search(r'[pat]tern',</span> 'string')</tt></td>
</tr>
<tr><td><tt class="docutils literal">re.finditer</tt></td>
<td>Return an iterable of match objects (one for each match)</td>
<td><tt class="docutils literal"><span class="pre">re.finditer(r'[pat]tern',</span> 'string')</tt></td>
</tr>
<tr><td><tt class="docutils literal">re.findall</tt></td>
<td>Return a list of all matched strings (different when capture groups)</td>
<td><tt class="docutils literal"><span class="pre">re.findall(r'[pat]tern',</span> 'string')</tt></td>
</tr>
<tr><td><tt class="docutils literal">re.split</tt></td>
<td>Split string by regex delimeter &amp; return string list</td>
<td><tt class="docutils literal">re.split(r'[ <span class="pre">-]',</span> <span class="pre">'st-ri</span> ng')</tt></td>
</tr>
<tr><td><tt class="docutils literal">re.compile</tt></td>
<td>Compile a regular expression pattern for later use</td>
<td><tt class="docutils literal"><span class="pre">re.compile(r'[pat]tern')</span></tt></td>
</tr>
</tbody>
</table>
<table border="1" class="docutils">
<caption>flags</caption>
<colgroup>
<col width="20%">
<col width="80%">
</colgroup>
<thead valign="bottom">
<tr><th class="head">Flag</th>
<th class="head">Description</th>
</tr>
</thead>
<tbody valign="top">
<tr><td><tt class="docutils literal">re.IGNORECASE</tt></td>
<td>Match uppercase and lowercase characters interchangeably</td>
</tr>
<tr><td><tt class="docutils literal">re.VERBOSE</tt></td>
<td>Ignore whitespace characters and allow <tt class="docutils literal">#</tt> comments</td>
</tr>
</tbody>
</table>
</div>
 </div>

</div>




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